Why should anyone want to use Kubuntu? Kubuntu's KDE is really bad generally and 8.10 made it worse.
On my work PC where (K)Ubuntu is installed, KNotify crashes constantly, user management is no longer in SystemSettings but in a separate app called KUser, Adept is as bad as ever, translations where imported very lousy, and the system tray is completely broken.
Just have a look at this screenshot: http://picasaweb.google.com/kamikazow/KDE#5263349303565209554